[R] help

[Petr Pikal]

Hi

I agree with Dieter. I think you are probably looking for some 
aggregation function (aggregate, tapply, by,...), but it is only a 
guess. 

Sometimes it help me to answer my questions myself before I actually 
post it to Rhelp when I try to elaborate an example using artificial 
simple data for others to understand what I am trying to do and how I 
fail.

HTH
Petr


On 27 Apr 2006 at 6:20, Dieter Menne wrote:

To:             	r-help at stat.math.ethz.ch
From:           	Dieter Menne <dieter.menne at menne-biomed.de>
Date sent:      	Thu, 27 Apr 2006 06:20:44 +0000 (UTC)
Subject:        	Re: [R] help

> Anamika Chaudhuri <canamika16 <at> yahoo.com> writes:
> 
> >   I was trying to calculate an age adjusted rate for which we have
> >   the 
> formula as 
> >   sum(weight*rate)/sum(weight). I am using the framingham dataset
> >   called fram 
> here.I cant figure out how I
> > could change the logical statement I have for the standard dataset
> > (in red) 
> to calculate weight and
> > calculating the wevents and atrisk(in red)
> 
> ... lengthy code follows
> 
> If you want to get an answer, provide as good subject line and a data
> set (e.g. part of Framingham). Nobody loves to wade through so many
> lines of code without the chance to check out what is intended.
> 
> Dieter
> 
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Petr Pikal
petr.pikal at precheza.cz